Accession Number : ADA265417


Title :   A Status Report on Research in Transparent Informed Prefetching


Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE


Personal Author(s) : Patterson, R H ; Gibson, Garth A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265417.pdf


Report Date : Feb 1993


Pagination or Media Count : 16


Abstract : This paper focuses on extending the power of caching and prefetching to reduce file read latencies by exploiting application level hints about future I/O accesses. We argue that systems that disclose high-level knowledge can transfer optimization information across module boundaries in a manner consistent with sound software engineering principles. Such Transparent Informed Prefetching (TIP) systems provide a technique for converting the high throughput of new technologies such as disk arrays and log-structured file systems into low latency for applications. Our preliminary experiments show that even without a high-throughput I/O subsystem TIP yields reduced execution time of up to 30% for applications obtaining data from a remote file server and up to 13% for applications obtaining data from a single local disk. These experiments indicate that greater performance benefits will be available when TIP is integrated with low level resource management policies and highly parallel I/O subsystems such as disk arrays


Descriptors :   *INFORMATION TRANSFER , *ACCESS , *INPUT OUTPUT DEVICES , *COMPUTER FILES , SOFTWARE ENGINEERING , OPTIMIZATION , COMPUTATIONS , THROUGHPUT , HIGH RATE , DECISION MAKING


Subject Categories : Computer Programming and Software


Distribution Statement : APPROVED FOR PUBLIC RELEASE